odoo-membership-addons/membership_initial_discount/models/membership.py

# -*- coding: utf-8 -*-
# Part of Odoo. See LICENSE file for full copyright and licensing details.

from odoo import api, models


class MembershipLine(models.Model):
    _inherit = "membership.membership_line"

    @api.model_create_multi
    def create(self, vals_list):
        res = super().create(vals_list)
        for line in res:
            discount = line.account_invoice_line.discount
            if discount:
                line.member_price *= discount / 100.0

        return res